1

Perhaps Prostate:
You may be have some discharge from the prostate that is trailing the urinary stream. Depends on many situations and factors. If you are not having symptoms, observe for a while. If persistent and or if you are having symptoms of other concerns, get it checked out by your pcp or with a urologist. Sounds like a benign (not so important) problem or issue.
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Urine is the product of the kidneys, which is produced to eliminate the waste products of metabolism, manage body fluid balance, &maintain acid-base balance. The blood is first filtered by the kidneys, and the composition of the resulting fluid is then altered depending on the body's needs. It is composed of mostly water, and breakdown products from blood cells impart the yellow color (urobilin).
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4

Semen:
When the prostate gland is overflowing from semen, or if you are not emptying the prostate gland with ejaculation on a regular basis you can have situations where you will leak excess semen in a manner like you describe.
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Professional exam:
Swelling or irritation suggest yeast (thrush), but discharge description and odor are more like bacterial vaginosis or perhaps trichomonas. Depending on risk, STDs like gonorrhea or chlamydia are possible, especially at your age (21). Diagnosis should not be difficult. See your doctor, or perhaps your nearest NHS GUM clinic for highly expert, lifestyle-sensitive care. Good luck!
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10

Unclear info for...:
Do you mean some dribbling after completing urination? How long has it been? Has it bother you? Without further specifics, relevance, & sequence of events of all related symptoms + physical exam + testing as needed, it is hard to draw a conclusion. But, it isn't hard to put all related things together correctly by following info in articles listed in http://www.formefirst.com/onDealSickness.html.
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13

Gonorrhea?:
In many cases, gonorrhea infection causes no symptoms. The common symptom is a pus-like discharge from the tip of the penis. The cause of the disease is bacteria that passed from one person to another during sexual contact.
Rec.: see your pcp for evaluation , diagnosis and treatment.
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16

Needs exam:
Lumps, bumps, blisters and other skin abnormalities on the genitals need to be evaluated. An examination will be needed to know the cause and treatment. Warts, syphilis and herpes are possibilities. The discharge can be several infections as well. Get tested
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18

STD?:
I suspect he has the STD called gonorrhea. He may also have chlamydia, & possibly others as well, since the presence of one STD makes it far easier to be infected by all others. Both you AND he need to be examined & treated as SOON as possible. If no other option, do go to a local STD clinic - confidential & affordable. Run, don't walk!
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19

Here are some...:
Clinically, you seem okay although seeing yellow urethral discharge, but your scenario hints you need a big personal effort to plow along your life more than medications. To explore such possibility, go to http://formefirst.com/eNewsletter06.html and formefirst.com/eNewsletter.html. Best wish...
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A discharge is considered to be any fluid coming from the penis. Urine is generally excluded (unless it is leaking out at at other times) and semen is considered a normal discharge. It can be any color or consistency, depending on what it is made up of. A clear discharge during excitement or immediately after sex can be normal. Discharges at other times should be evaluated.
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Discharge can be a noun or a verb; it has multiple meanings in physics, chemistry, military, and legal usage. The most common medical meaning is a substance that is being excreted. Examples: pus is the discharge from a pimple; a vaginal discharge can mean infection; an ear discharge can mean an infection of the outer ear tract; a nasal discharge may be a 'cold'.
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